William xaisling



Aug. 25, 1925. 1,551,310

W. KAISLING RECEIVER Filed March 3, 1921 if @LW/,r

Paieniea Aug. 25, i925.

UNITED. STA

TESy PATENT carica. n

, WILLIAM KAISLING, F CHICAGO, ILLINOIS, ASSIGNOB TONKELLOGG SW'ITGHBOABD AND SUPPLY COMPANY, 0F CHICAGO, ILLINOIS, A "CORPORATION OF ILLINOIS. Q

nncmvn.

Application med Iarch 8, 1921. 'Serial ll'o. 449,886.

To all whom t man] concern.

Be it known that I, WILLIAM KAISLING, a. citizen of the UnitedStates of America, and a resident of Chicago, rcounty of Cook, and

State of Illinois, have invented certain new and useful Improvements in* Receivers, of

which the following .is a specification.

Myinvention relates to receivers and has to do more particularly with the so-called -Watch-case receivers which are used as head receivers for telephone switchboard operators. i g An object of my invention is the provision of a receiver of sim lified construction, and in which the weight is reduced to a minimum without impairing the efiioiency ofthe device. i

*In receiversl of the above type as now used, the outer 'casing-of". insulating material and the magnets,- which are circular in form, are of a size to fit along the inner periphery of the said casing, and these magnets usually make up the greater portion of lthe receiver weight, and'this weight 1s ob- I. provision vof a ypermanent Imagnet leccentrically dis osedwitlrrelatiofnto the central structed yastopermit the pole pieces and 40 jectionable because of the strain upon the operator, and by my improved construction the weight is greatly reduced.-

A feature of my invention is to provide a receiver of this type with improved binding posts of the concealed ty e, and the receiver cord terminals are enc` osed within the terminal block of the receiver' iny such. a` way that they are effectivelypreventedfrom bfeingshort-circuited; 1 i

Another feature of. illy/invention is the i openingfo f the receiver cap, bu'tso con'- 'magnet coillsl as a 'whole to be mounted ceil-l trally in relationgwlitih the` diaphragm '9i'.

the receiver.

Still lanother feature of my invention` is the provision of an improved securing means for fastening the head band to the receiver, whereby it is' pivotally supported and held to its supporting means without additional fastening means such as screws.

The above features,'as well as others, will be more fully hereinafter described, and. for a' 4clearer understanding of my inventionI reference` may be had to the accompanying drawing, in which like reference characters in the several views denote like parts, and

in which- Fig. 1 is a rear view of the receiver of"y my invention.;

Fig. 2 1s a vside view of'the receiver; Fig. 3 1s a face view of the receiver rof my invention;

Fig. 4 is a face view of the receiver with piece or cap and the diapragm rey,

vention as illustrated, it comprises a'shallow shell or casing 2 of suitable insulating ma'- vterial, such as moulded bakelite or hhard rubber, the said' casing4 2 being provided with exterior threads 4 at Jits forward end, i

upon which is screwed the ear piece' or .receiver cap 5, which is. also of insulating n V material such ask bakelite, the said capv 5 serving to clamp the receiver diaphragm 6 between the .forward end ofthe casing 2 and receiver cap 5. The cas-ing 2 is provided with a rearwardlyextendin cup member 7 eccentrically dis osed in re ation with vthe center of'l the casin 2, the 4said cup member f7 being integrally ormed with the said casing andthe said cup` member 7 receiving the permanent vmagnet` M, as will now be de-v scribed. I

The permanent magnet M consists of a plurality of horseshoeshaped pieces 8 of steel or 'other suitable` magnetic material, each of, which is permanently magnetized, said magnets being placed one upon another and being rearward yextending Acup member 7 and fit along the inner periphery of the said cup member 7, with'their. ends 9 terminating l over the portions 10 of the pole pieces 11, .as clearly illustrated in Fig. 5. The pole -piecesll arey bent, the portions l0 passing beneath the ends 9` of the permanent magnet M, and the portions 1,1( extend upwardly in proximity to the receiver diaphragm 6 of such shape as to rest inthe and carry the `magnet coils 12. rlhe permanent lmagnet M, when resting in the eccentrically disposed cup-shaped member 7., is

` magnet M and openings 16 in the bottom of .l so

1 of the transmitting' f the cup-shaped member 7 and have screwfthreaded engagement with suitable tapped orifices 17 in the metal rod 18,7wh-ich rod` may, be imbedded in a rib on the bottom outer face of the cup member 7 of the receiver during the moulding operation of the same. The rod 18 also serves as a securing means or su porting means for the receiver head band as will be more fully hereinafter described. i

From the above description it may berseen that by providing an eccentrically disposed cup member 7, I am enabled to reduce the size of the magnet considerably, and the magnet M which rests in the eccentrically disposed cu is so constructed as to bring the poles o the magnets in the center With relation to the diaphragm.- This type of construction* permits the use of a much smaller magnet and. reduces the weight considerably, but ldoes not impair the eiiciency In order to connect the magnet -coils 12 in` the electrical circuit in which the instrument is to be used, suitable bindng'posts B are provided. `Aseparate terminal `block 2O is provided and is of suitable insulating material suchfas bakelite, and the terminal studs 21 are rovided which are suitably imbedded in t e terminal block 20 during the moulding operation of the same. The studs 21 are provided with reduced portions 22, which are threaded and extend through suitable orifices 23 in the bottom of the cas- 21 and clamp the terminal clips 24 between said nuts 26 and the casing 2; The terminal clips 24 are rovded with terminal ends (Fig. 4) to-w 'ch the terminals of the coils 12 are soldered. When the lock 'nuts 26 are tightenedupon the threaded portions 22 of the studs -21, the said nuts 26 also secure the terminalv block 20 to the bottom face of the casing 2. The portion of the studs 2l which are imbedded fin the terminal block 20 are provided with transverse orices27, and the 'ices'v 27, clamping screws 30 are provided,

engaging the centrally tapped orifices 31 in the stud 21. The said screws 3() when tightened clamp the metal tips 29 `in the said openings 27 against displacement. The ter- `-minal block 2() is provided with an orifice 32 through which the strain cord 33 of the receiver cord is inserted and tied so as to relieve vthe 'strain from the cord teminals 29.

The receiver head 'band support comprises a U-shaped member 34 of suitable spring metal upon which the head band H of spring wire is pivotally secured by means f of the clip 38 provided with a pair of extensions 39, which are suitably formedover the ends 37 of the Wire head band H- The member 38, which supports the head band H, Y

U-shaped member 34 is slightly smaller than the width of the rib 44 Yformed upon the cup member 7, and to place the member 34- in pivotal engagement with the pins 42 the legs of the U-shaped member 34 are forced apart and released so as to slip orices 43 over the pins 42. When in this position the Ilegs of the member 34 fare under spring tension and hold said member 34 and head band H in pivotal position upon the pins 41 and the pivotal support of the head band H by means of the pivot 41 and the pivotal supports of the U-shaped member 34 upon the pins 42 permits a ready adjustment of the receiver so that it can lalways rest in a correct and easy position against the operators ear.y

Having described a specific form of my invention, l do not Wish, however, to be limited to the exact structure as illustrated and described, but aim to cover all changes themselves in vthe appended claims.

What I claim as new and desire-to' secure by United States Letters Patent, ish:

1. In a receiver of the class described,

and modifications as will readily suggest v l comprising a diaphragm and a casing p-rovided with an eccentrically disposed cup member intergally formed therewith, apermanent magnet in said cup member, and pole pieces `for said permanent magnet positioned adjacent to the center of said `dia- `2. In a receiver oi" the class described,lfA

comprising a diaphragm and a casing IO- vided therefor with a rearwardly extending cup member, eccentricto the diaphragm, a permanent magnet in said cupl member, pole pieces fory said permanent magnet supporting magnet coi s and so positioned as to place. the said pole pieces :at the center -of said diaphragm.

3. In a receiver ofn the class described,l

comprising a casing provided with -a .rea-rwar ly extending cup member eccentrically disposed in relation with the center of said casing, said cup member being integrally formedfwith saidy casing, a diaphragm, a

` permanent magnet resting in said cup memi parts within said casing, binding posts inserted in said and securing saidy connection means in cony nuts having screw-threaded engagement ber eccentrically disposed in relation with the center of said diaphragm, pole piece ex- A .outer casing and amagnet and cooperating parts Within said casing, a `terminal block, binding posts inserted in said terminal block, screw-threaded extensions for said lbinding. posts extendingy through openings in the rear wall of said casing, connection `means for the magnet coils within .said casings between saidleoils and said 4binding posts, andvlochD nuts having screw-threaded engagement with the threaded extenslons for securing.- said terminal block to said casing tact relation with said terminals.

6. In ya receiver, the combination of an outer casing, a magnet and cooperating parts within said casing, a terminal block, binding posts carried by said terminal block, screw-threaded extensions for said binding posts extending through suitable openings in the rear wall of said casing,terminal clips for the magnet coil within said casing, lock withnsaid threaded extensions for securing terminal block to said casing and said cap.

terminal clips in Contact relation with said terminal, and transverse apertures in said binding posts for receiving the cord tips of a yreceiver cord.` 4

7. In a receiver, the combination of an outer casing, a magnet and cooperating parts within saidcasing, agpair of binding posts, a terminal block, said binding posts being concealed within said terminal block, threaded extensions for said binding posts extending from said terminal block and into openings in the rear wall of said casing, lock nuts having screw-threaded engagement with said threaded extension for securing said block to said casing, connection means between said binding posts and the magnet coils' in said casing, and each binding post being provided with an aperture for connection to the receiver cord, the terminal block being provided with openings' for the receiver cords, and binding screws inserted in each of said binding posts.

8. In a receiver having an outer casing, a

permanent magnet and cooperating ,parts within said casing, a pair of binding posts,

the

a terminal block, said binding posts being concealed within said terminal block, threaded extensions for said bindin posts extending from said terminal bloc and through openings in the rear wall of said casing, lock nuts in threaded engagement with said threaded extensions for securing said terminal block to said casing, central tapped orices through said binding posts, transverse orifices in the said binding posts to receive the cord tips of the receiver cord and binding screws having threaded engagement withy saidgcentral orifices in said binding posts for retaining the cord tips binding posts.

9. In a receiver oftheclass described, a

diaphragm and its electromagnet, a permanent magnet therefor extending angularly to one side of said electromagnet, and an enclosing case provided with an integrally and eccentrically formed pocketvof a size to recelve said permanent magnet, a cover cap for enclosing said diaphragm, electromagnet andpermanent magnet, said diaphragm .being clamped between said case and said cover 0. A receivenofthe classdescribed, including a diaphragm andits electromagnet, asupprortingand enclosing case therefor of insulating 'material pro/vided with an integrally and eccentrically formed pocket, a

permanent magnet forengaging said pocket i so. thatthe same is positioned eccentric to said diaphragm, anda cover-cap for said case adapted to engage said diaphra In to secure said diaphragm inoperative re ationv with its electromagnet. l

11.y `In a receiver of the class described, a diaphragm provided withga centrally disposed electromagnet, an enclosing case proin orifices of said having vided With an integrally andy eccentrically formed pocket, a laminated permanent magnet for engaging said pocket so that said magnet is mounted eccentrically to said diaphragm, and means for securing said per# fmanent magnet being secured eccentrically to said diaphragm and said electromagnet being secured centrally to said. diaphragm. 13. In a receiver of the class described, a

i diaphragm With a centrally disposed electromagnet and an arcuate shaped permanent magnet therefor, an enclosing case, a cup member integrally formed with an eccentric to said enclosing case for receiving said permanent magnet and said .electromagnet so that said magnet is positioned beneath a substantially diametrical section of the diaphragm only and said electromagnet is positioned substantially beneath the center of said diaphragm.

14. ln a receiver of the Vclass described, adiaphragln With its electrcmagnet, an arcuate laminated permanent magnet therefor eccentric to said diaphragm, an angular pole piece for said magnet constituting the core of said electromagnet, and an enclosing case having an integrally and eccentrically formed member for receiving said permanent magnet, electromagnet and said pole piece, sc that said magnet is positioned eccentrically to said diaphragm and said electromagnet is positioned centrally to said diaphragm, and means for securing said magnet and electromagnet in position.

l5. ln a receiver of the class described, a diaphragm and its electromagnet, an enclosing case for them, and a terminal block for the receiver cord terminals, detachably' mounted on the exterior of said case, said terminal block adapted to receive the receiver cord terminals and to secure the same to and Within said terminal block.

16. ln a receiver of the class described, a diaphragm and its electromagnet, an enclosing case for them, a terminal block for a receiver cord terminal on the outside of said case, and mechanical connecting means operated from Within the .case for attaching and detacliing said block, said terminal block adapted to receive the receiver cord terminal and to have the same secured to and Within said terminal block.

i7. ln a receiver of the class described, a diaphragm and its electromagnet, an en- Vscribed includin diaphragm and its electromagnet, a per-l manent magnet, an enclosing case for them, a terminal block on the outside of said case with a terminal for connection to a receiver cord, the connection of the terminal and receiver cord being within said terminal block,

'means operated from within said case for attaching said block, said means serving also to connect said terminal and said electromagnet. i i

19.l[n a receiver of the character dean outer casing provided with an integral y and eccentrically formed cup member, and a magnet land cooperating parts secured within said cupr member 'and said casing, a terminal block, .binding posts secured insaid terminal block and provided with means `for securing said terminal block to' said casing, a terminal for each of said binding posts, and means for securing each of said terminals on itsbinding post.

20. ln a receiver of the character described including an outer casing provided with an integrally and eccentrically formed cup member, a permanent magnet and an electromagnet, and other cooperating parts secured Within said cup member and casing, a terminal block secured to said casing, binding posts for said terminal block, said casing and terminal block being provided with openings for receiving terminals of a receiver cord to permit the connection of said terminals with said binding into said caseV and con=,

posts, said terminals having electrical conv nection with said electromagnet.

21. ln a receiver of the character described including a casing provided with an integrally and eccentrically formed cup member, a permanent magnet and magnet coils secured Within said cupmember and casing, a' terminal block secured to said casing, cylindrical members secured in said terminal blocks and electrically connected to said magnet coils, said terminal block and casing being provided with openings for receiving terminals of a receiver cord to permit the contactual engagement of said terminal and said cylindrical members, and means for engaging` said cylindrical members and said terminals for retaining said terminals in contactual engagement with said cylindrical members.

22. ln a receiver of the character described including a. casing, a permanent magnet and magnet coils secured therein, a terminal block, binding posts secured in said terminal block by frictional engagement, said binding posts adapted to secure said binding posts, and terminals for said" said terminal block to said easing, said binding Cposts t0 permit connection between terminal block and easing adapted to re- Said bin ing posts and said magnet coils. 10 ceive the terminals of a receiver cord and Slglled by 1116 at ChICgO, in the @Ounty 0f v 5 to permit the terminals to engage said bind- Cook and State of Illinois, this 1st day of ing posts, screw members for engaging said- March, 1921. i binding posts to secure said terminals to WILLIAM KAISLING. 

